-1/4 a^{v0}_{c2} b^{c0,c1}_{a0,a3} c^{c2,a4}_{a1,a2} gamma1^{a3}_{a4} a+(a0) a+(a1) a+(a2) a-(v0) a-(c1) a-(c0)
+1/2 a^{v0}_{c2} b^{c0,c2}_{a0,a3} c^{c1,a4}_{a1,a2} gamma1^{a3}_{a4} a+(a0) a+(a1) a+(a2) a-(v0) a-(c1) a-(c0)